International T-20 Trac Tractor

try the red power site .

http://www.redpowermagazine.com/
Go to the forums list, then construction equipment-

PS-don't know nothin' bout no Clayton...

1922 CLAYTON 40 HP CHAIN RAIL
In 1916 Clayton Shuttleworth Ltd. of Lincoln,
England, was awarded a government contract by
The British Food Ministry to design and construct
500 crawler tractors. Accordingly, the
Lincolnshire factory manufactured the prescribed
35 hp tractors to assist with the production of
food, during the latter part of The Great War.
In 1922 the firm introduced a new model named
the Clayton 40 hp Chain Rail, which was simply
an improved version of the 35 hp unit. It was
powered by a four cylinder petrol/kero Dorman
engine which produced its 40 hp at 1200 rpm
and the transmission featured a two forward and
one reverse gearbox.
The four ton tractor could sustain a drawbar pull
of 4,780 lbs in low gear, but at the cost of
consuming four gallons of kerosene per hour.
Directional control was by a steering wheel which
activated a brake drum located on each side of
the track drive gear. The brakes could also be
applied with individual foot pedals.
The Dorman engine had to be hand cranked into
life. The ML impulse magneto meant that a sharp
pull-up of the handle was usually sufficient to
start the 6,326 cc engine. Petrol was used for
the start and then, following a warm up period,
the petrol was turned off and hot kero
introduced into the carburettor. Although not as
efficient as petrol, the kerosene was available for
around half the price.
Opinion: Clayton Shuttleworth Ltd. had been
around since 1842 and its range of threshing
mills and steam engines was held in high respect
by farmers world wide. The same integrity of
design went into the Clayton 40 hp Chain Rail
tractors. Individual components were, by today's
standards, over engineered. But then — nothing broke!
The Chain Rail track gear was based upon
technology pioneered originally in Lincolnshire in
1870 (which pre dates the Caterpillar lineage of
track design). But there was nothing old
fashioned about its design. Indeed the Chain Rail
tracks could be compared favourably with those
fitted to many modern crawlers.
During my research into Clayton & Shuttleworth
and the firm’s subsequent acquisition by Marshall
of Gainsborough, I was privileged to be
introduced to an old timer at The Museum of
Lincolnshire Country Life. In his youth he had
spent many hours driving a Clayton 40 hp Chain
Rail. According to him, the Clayton was so
dependable that it was the only tractor of the era
that never had to be towed home behind a horse

Pics
http://www.steel-wheels.net/clayton.html